Myrmecia regularis is a species of ant endemic to Australia. A member of the genus Myrmecia in the subfamily Myrmeciinae, it was first described by American entomologist Walter Cecil Crawley in 1925. These ants are medium to large in size, measuring 10 to 20 millimetres (0.4 to 0.8 in), and they are bright brownish-red in colour. Queens and workers share similar morphological features, but they can be distinguished by the noticeable size difference. Males also look similar, but collected specimens are too damaged to be examined properly.

Myrmecia regularis is found in the south-western coastal regions, inhabiting eucalypt woodland and open forests. They nest underground and do not build mounds. Workers are active during the day and night, foraging on trees in search for prey and sweet substances such as sap and nectar. The larvae are strictly carnivorous and only eat insects that workers capture. Nuptial flight occurs around February to April, with queens shedding their wings inside the nest and mating near to their parent nest. Queens tend to look for food for their young before they hatch, taking as long as eight months to develop. Certain frog species are known to dwell inside M. regularis colonies.

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